Originally published in 1962, this autobiographical account by the military head of the Manhattan Project, Leslie Groves, includes a new introduction by Edward Teller. Groves describes his leadership of the Manhattan Project from its beginnings in 1942 to the early postwar period when the Atomic Energy Commission (AEC) assumed responsibility for nuclear weapons and programs. He provides detailed recollections of this massive effort that included research and development at Los Alamos, Oak Ridge, and Hanford. His narrative also includes the military intelligence mission to determine the status of the German atomic bomb effort. Groves describes the Trinity test as well as the planning and execution of the missions to Hiroshima and Nagasaki. His final chapters address the transition from military to civilian control of nuclear weapons. The appendices contain a number of interesting papers and correspondence.